clc;
close all; 
clear;     
time = 20;%unit s
Fs=10;
t = 0:1/Fs:(time-1)/Fs ;
x = xlsread('200HZ.xlsx')';




x=x(1:(time*Fs));

% x = -x
% [value,t]=findpeaks(x,'minpeakdistance',1000,'minpeakheight',-10000);
% plot(t,value,'*','color','R');
% hold on

plot(x)
axis([0 350 4000 6000]);
hold on


